you couldn't [easily] use the imac monitor for a tv display, but you can get a usb tv tuner (that has a video input like coaxial or rca or component) and use that to put tv signal to computer to display on the screen. if you don't need cable or satellite tv, my imac works great for netflix and dvd movies :). there are USB bluray drives you can buy, also, allowing playback and recording of bluray discs on your mac (which WILL be worth it with the imac's native resolution and screen size).

I'm not sure what to order to connect the MacBook Air to an older version of the Mac desktop. The Mac desktop is a 2007 or older. I want to make sure I order the correct adapter so that both screens can be viewed simultaneously.

I'm really confused because I heard that the Mini Displayport to DVI adapter resolution only goes up to 1920 x 1200 max but my monitor's resolution is 2048 x 1152 so that won't work. And I was thinking to buy the Mini Displayport to dual-Link DVI Adapter but I herd it doesn't work with other monitors only the 30inch Apple Cinema Display and its way to much for an adapter. So what could I do im stuck is there anything I could do?

Your display has a 1920x1280 native resolution making it unnecessary to buy this adapter as it is designed for resolutions of 2560x1600. All you need is the standard mini-displayport to DVI adapter and a DVI cable. But don't be fooled, you will still get HD video from that little adapter.

I have two 30" Apple monitors that have DVI connectors. I want to buy a new MacPro, but use my two old 30" monitors. I'm trying to find a solution for this since the Mac Pro doesn't have DVI connections.

You don't seem to understand the basic principles here. Your HDTV is 1920x1080 pixels resolution MAXIMUM. You cannot make that any higher, no matter how big the HDTV is (even a 70" screen), it's a physical number of pixels the manufacturer has made that screen to itself.

If you want a higher-than-HD resolution on a big screen you have to use a super-HD "extra high resolution" (hence generally more expensive than HDTV prices) monitor such as Apple's 30" or another brand such as Dell. These have 2560x1600 pixel resolutions, hence why they need this "Dual-Link" (ie. *special*) DVI adaptor to power those extra pixels that standard DVI cannot handle.
If you want to continue with the HDTV for a monitor (ie. 1920x1080 maximum resolution) you just need the standard connection cable (with an adaptor as needed: to DVI/VGA/HDMI on the back of the HDTV), not the Dual-Link one.

One other thing you can do is run TWO lower resolution screens (eg. 2x 1080 full HDTV's) that each run from the mini, to gain more resolution real estate (2x 1920x1080 = 3840x2160 over the two screens). One plugged into the Mini DVI port (with relevant adaptor to DVI or VGA or HDMI on first TV), another one into the Mini DisplayPort (with relevant adaptor to DVI or VGA or HDMI on second TV). Setting extended mode in your mini's System Pref's.
NB: some of those adaptors are made by Apple, some by third party.

If not, then what is? I am interested in purchasing a MBP and would like to have a dual monitor system, but the price for the cinema display is hefty, and I don't have the room on my desk for it, so I will go with something a little smaller. I am wanting the know the best (and cheapest) way to connect a MBP to an off brand (HP) monitor.

I appreciate your help and am looking forward to dumping my PC. Thanks

I have a 15" MacBook Pro. I'm currently using this cable to connect a 30" cinema display at full resolution to my Thunderbolt port and a USB port. I want to add a Thunderbolt storage solution. Is seems like I should be able to add a storage device, connect it directly to the MacBook Pro thunderbolt port with a thunderbolt cable, then connect the DVI adapter to the thunderbolt storage device at the end of the daisy chain (as long as the USB port connects back to the MacBook Pro). Anyone know if this will work? Will I lose resolution? I/O performance?

I am trying to find an adapter so that I can use my computer wither with my tv or a second monitor. This is the only wire I can find that will fit the new mini display port. Is there one more similar to the cheaper adapter for the older macbooks or is this the only wire that will fit my mini display port?

It depends on the input of the monitors. DVI or VGA.
You can get a third-party DVI to HDMI adapter, but Apple doesn't have one.
So then you could use DVI cables, VGA cables or HDMI cables.
Now, if you have a Mac Pro you are in luck, because you can install a second video card... if you have a MacBOOK Pro, you are screwed, as you can only drive ONE external monitor.
If you are considering a USB video adapter, don't as moving images are terrible over USB.